On 01/07/18 02:17, Alan Gauld via Tutor wrote:
On 30/06/18 03:55, Chris Roy-Smith wrote:
I am trying to change the command of a tkinter Button in my program.
Eventually I want to be able to do this to many buttons.
Since I'm not 100% sure if you mean the command or the label or both
here is a simple example that does both...
############################################
import tkinter as tk
def cmd1(): print('This is command 1')
def cmd2(): print('This is number 2')
I was hoping eventually to generate the command form the results of a
database query, not knowing the exact command until run time. Perhaps
what I was trying to achieve is too close to self modifying code, I was
warned off this when I used to dabble in assembler. Does the same advice
hold for python?
def swapCmd():
c = b1['command']
# kluge to get the function name from Tcl id
if str(c).endswith("cmd1"):
b1['command'] = cmd2
else:
b1['command'] = cmd1
I never thought to try anything like this, I was thinking more along the
lines for how to change the text of a Labe.l
def swapText():
t = b1['text']
if t == "Cool":
b1['text'] = "Hot"
else:
b1['text'] = "Cool"
# make GUI
top = tk.Tk()
win = tk.Frame(top)
win.pack()
b1 = tk.Button(win,text="Cool", command=cmd1)
b1.pack()
b2 = tk.Button(win, text="Swap text", command=swapText)
b2.pack()
b3 = tk.Button(win, text="Swap cmd", command=swapCmd)
b3.pack()
top.mainloop()
###########################################
Thank you again Alan,
While your solution works, it's not how I imagined in terms of approach.
Eventually I wanted to change the command of a variable number of
buttons with the actual command depending on the results of a database
query. I am unable to see how I can manage this in your solution style (
predetermined commands) might be difficult to achieve ( with my limited
programming skills ). Your solution made me rethink what I was
attempting to do, and found with a slightly modified database query, I
didn't need to change the command at all. The rest of this bit of
program I have already solved.
Now I just have to learn a lot more about classes, and objects.
again, thank you Alan.
Regards, Chris Roy-Smith
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